@book {mason2005,
    author    = "Mike Mason",
    title     = "Pragmatic Version Control Using Subversion",
    publisher = "The Pragmatic Programmers LLC.",
    year      = "2005",
    series    = "The Pragmatic Bookshelf",
    edition   = "1st",
    month     = "February"
}
@book {sussman2007,
    author    = "Ben Collins-Sussman",
    title     = "Version Control with Subversion",
    publisher = "TBA",
    year      = "2007",
    edition   = "Compiled from r2866",
    annote    = "http://svnbook.red-bean.com/"
}